Melatonin in young children?

So I might be naive but I know a girl who gives her 4 year old 3mg of melatonin every night to help him sleep. Is this safe? My boyfriend who is 22, 5'9" and 190lbs take 5mg and his doctor told him that was too much.

Is it really safe to give a child that young melatonin on a nightly basis? I feel like that's ridiculous!!

I give my 4 year old son melatonin occasionally. I split a 3mg pill in half & give it to him in his drink. I know a lot of people that give it to their kids both regularly & occasionally. I don't think doing it everyday is good, just like anything. I take it on occasion as well & it works well.

On a regular basis unless directed by a daughter that's NOT a good idea. Of course I gave it to my son once and it hyped him up, he was up til like 1am lol things like that seem to have the opposite affect on my son.